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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cafd14c7ac4bc118f6063820dd6f0c01e51631cd18c8ee2c2bb62f5630326f7' 
  AND token = '4vdr/io7YlF7TQBxh95CVlvAqs6jmXLZkTqhytVBCj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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