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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67da57279be86765a25bd1f3cf479791f6eabcb894ae5b37309ce392b07707a1' 
  AND token = '/DcMc73jmhg7JYC7CiK/n3nXDWsR4MS4z0rVtXZXl6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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