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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b3631a36b16e90f18b00f1873be765f7ee834327d62fd327286ec488df66de4' 
  AND token = 'OMoOgLh8Y3h1mu0Juwc7t5ZUzYKT1VuoydHmJTb30Q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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