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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e623df9d3624c919ba1215adfb5fda5769b1711d293acf2a3ad25ba0b7a9c0bf' 
  AND token = 'DqQw6I9o3wMdG5dP7FqBUOKbJs9tpVSAT8M85Msm+Ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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