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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cae5e8e72eb35ec5d589625635d9731491f087256c05e350390d500dfe8c1d8' 
  AND token = 'yBQEb8AQTf8yck3NWmczke87ptpVs5X3pZ4/b6SU/5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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