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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e93e6b61b2ab7361ffa4fa4c7ac98c600bd4ec01c90c367d46b662bd773a19c' 
  AND token = 'Euz7mvvws0mQApti/tO7i2QAqcN5fjnAJ/+1HHQvcMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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