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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24a9bfe8f888bc78bde120fceace57535707255ff81aefeddc685be58e4f02e9' 
  AND token = 'Hhubjx5lyZknD0fU6Py1B5S8rhs523DNgyjeboV0RzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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