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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d96f702aa4bb82315790a0ff3416680bb45f82efdf832584585de2e70ba7122' 
  AND token = 'QEHTFx072pQR+en/JbbOiE4X+5bkjA+2a8deI8IglAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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