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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60031c591b718fe9af15dc599b92ab592caddeb9c66ffd409c759f41ff850bab' 
  AND token = '4KIi9n/d+B2TekodBLwKXmIkdsAgCcm6RQg8nsrpJio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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