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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db4a4f7b5a1e70bcee20cc7ad47cd87767907ef7671d0f5bafea02efb5d67c56' 
  AND token = 'Y9TV3rrIB6wgdygc0E3zXF8X8jr7zf5pHU36RINH1IQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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