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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c73796962997768e0c30c0ea923d13bda169aca90892c986a94959598efb8b5b' 
  AND token = 'JflN7BhprttMLRFXYpZmc8l1aBi1m6zAuxgkx5Y32w0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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