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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c61c562955af7fdc6c41da1887693671ea3d7eee71dbd11048471349de65807b' 
  AND token = 'pXLto2Bg5DNlm64t8BKhZI6kIMfs/B8J4T1VSb4Jtx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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