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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b712251022c232d6b074ab890e69c627474c2925ed546e249782b4929271a685' 
  AND token = 'kL68PfZicXnW/zZLXI3vjSmH5oympB4ze39LK//lzIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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