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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '228c3091567f5d22e35083f1e39e5164d446a0ce9a6bc9f3b37dab8e7b7ed958' 
  AND token = 'TOEy9Yp3SY+DRwaMHA6z8bIvciP7RcNridnoj3Xc5F8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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