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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ca8ce698e1db271ad1dc2886527ed373bcbe7c752b584adaaa825716f9fa654' 
  AND token = 'Q8togA1A5+ykrlckYhEhr04v86nu/i+y6DQEoVEKHRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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