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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47b8f960cced5dafc414883b7e2c4c0bea6bcf29d3661e2de340a76ee4fda53e' 
  AND token = 'hLEFdruXU6DAsVtUM0ySzOCk+Lfp3r8xYHCHsNUQFhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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