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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '513e0894b6b4256155d93146ef53a6e936031bbd59a656e53a234752a3c17fca' 
  AND token = 'zLFrIOlC0GsQ1ClrsuXsOt1enLp45bNiqqpsAQzUCFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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