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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab23accee23acbf896a9c3a61e2921e12f868cf674c0f5d14928b820511f9f94' 
  AND token = 'M+Swuxjq20ZkYNR5vNun6SmaJAzMqj/qyhSnmJvcihE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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