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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a09276e1b4a398694937ccc2dd5fe127d2b682a898df9b2cfd56b5f56e72a388' 
  AND token = 'Arwbk26eckEeSqco/G7Q6fBYQjwPP7db2UCLmM1qIMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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