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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9124b41330d761d3a2c0cc56c72d1dd4b343ab1eb1883c2c4330ef752a47f2fb' 
  AND token = 'f7wRF7vzk5mqRzFjrtNX/S7NByRDg47hDt3O9ZvsJoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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