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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a13288e43305a6368bd45dd273dbe904bf013f31cd3a1fd325d087caa3dcd85' 
  AND token = 'Y9AOehqkjE6VWpK2jp1g6Gd+NLzAKtWL2080a7rwDu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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