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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9d5d9e7969b7e45acaa686606454b584d52b7137fc9f1fb318c5e48a8c2b05a' 
  AND token = 'L7E1kuAnejYZur0j3wlufMysWIhh5O/eQ4D5s4THDF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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