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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb2027879f4728f6026fbc834843ba020242d36a18dd4c7084e4b14052269108' 
  AND token = '564BPt5/acwDMqz0kPMmaThqc0wpmOiP9EmGhpInvtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}