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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dc64415cd2f333f8279b0e3f9c430ca4d54c91ad29e749c5496446f0d3b8c77' 
  AND token = '2mfgcpmrAf4ABpWKbSApLqcQ53IirrpL7GH3bPZ8Izo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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