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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6300c5340d0ce56598ec10b9ea4dc7a1b91914a96c98cb9fd6611c603a83b8e6' 
  AND token = 'QbPHezwuzI3M49ebFXbdKyVtZpT5Ea3PiB6Xicjjdqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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