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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc47c2d742e0574c00091933fd7d487f0d096118691297e34830508c58e6ec0a' 
  AND token = 'kkLH8LNsn/jjBlOTNKJ14KzsGbloqDC87R4uK6NLxyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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