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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f232fd3a9b07c600742621ce6212a424eed4c71a7c643fcb269d5ba93b8dc61' 
  AND token = 'ls+5tlExFEg6DBraN4g0UMAkUzgxSN4TvnWuqI1cZnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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