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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9d308174f53603be53b45ebecc3765ce5e8d12e3891c4cf0f7daf23d36a7f23' 
  AND token = 'Hot1SNw5L4JbLy/gqcc0sNbnvZxztaYygbv6l0hihZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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