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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e8a79aa61e9c78939260f3259ca6f6e5815676818fda679c599f673d5d36ee5' 
  AND token = 'I+Z+r+WXyv8qOdcmVAt58saKkwL4Uuj95LVMlipUS3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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