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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9dcdd7f366d822c72368cc1d5ae99d1f2d5f0624d54678f5744f0208599ffb2' 
  AND token = 'VUFhdYgTdZOeUCGTZitrBKzlzMT8rhZ0M2QAGvZSfA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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