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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab9c7b576e999a994ed6dd20db67b1c0c5ccc03bf8ddd85be248afa979db1532' 
  AND token = 'Nc9EwxEMM5LYtsh1/LDgP49o08lyLQu7wyNUfem0cVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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