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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1700e52c29a31b4ea3bcc6fe83b22046b13daaab2731c9fa971ef2aac605397' 
  AND token = '5kF1TND+hH338xY+5mRqUWPCSk5dDZTVrl75ppXYPok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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