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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dd618f8822cc3c6669a80e02a61cfeb21d7e5b4cf0c08368c3109dfc2906e4a' 
  AND token = 'OFFqHg2liCW8ePdDhZbORGWtjds7ZmLgZ7+89Nr6cCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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