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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7220f707e4adaa157c5658b172d75906263fe3050670d3c18f742e55161f345' 
  AND token = 'azSgULx/EZS+K9qnPn6aJfIg9/Bu6IVR0oeQbpE/yP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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