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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd477a3cb0d5174ed7f555e592a6d46b95e1e7277f0dd544b2aa44a4eaed12e40' 
  AND token = 'j8WX9Qj0F1YIu8GJyGHJaYGPQ2HQCvbkbyib/nJq0vY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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