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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54582b6a22a7186c74b7a4084f2053d21d6ea74de9419305a23924a6c3a5fc19' 
  AND token = 'kKNSsnbir8LeZVav+DoZyC6R8HrOQHmA3ReON7e9/gU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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