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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '108835902e93e7dda27f2767ce6dcbdbb083505e59e4e6c8272be8b1ca1ed2ed' 
  AND token = 'KTeYr+m8xRcXXNfmRVa/juQd9ZfbSASzJeidb1bWF/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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