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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e694bd51ca2ade898f555b4e2861e48919ffd0e0f8bfff9a4768381d19aa78cf' 
  AND token = 'gFSalH7b/wH/6/sGxi3ZeZ6dZyGv1a3cYrppJFzmMms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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