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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b87c6bdb06568c097c2c2b5c9f04f1b5036a3432b47a952ff5e85bb65d8dc6d' 
  AND token = 'kn/oHe6xk3sDXBEdlzDI0IsUsDUI4d5ZVrGEitC3fm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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