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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b49a69efa3a87d4217492fa911b6f6ed342fdcb66119e43beb0049ccbee1598' 
  AND token = 'w4oIIbzKWKFJeaAq8vixncJPH3R32Z0Qo6ThQN02xFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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