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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8004821697a385606d9478e5cecae1854c6e3d67e2b404fe9629e83bc789faa2' 
  AND token = '2xwe8sgwa1AOBd0QPMbavP6LexI/FLQytBQeUPUslRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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