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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbb0beb6006a9f6429fba42206c338d0dcf11f5a31cdd7f0712dde6d6296a42f' 
  AND token = 'cMuBBU+6KfMLUdTSbPXfdIoTQW4woDwq+ajI5Pmx2v4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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