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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee005eb68f14142167800ccb2defd4667bfa026831a05c334974b39ec8ef37c0' 
  AND token = 'R0vUB1uPc4IxZCKMArgigQc8De8I2vWOEqAV8bYZ0VY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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