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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf65796b5ed58cf365250cad0035dfa7755c3d9230c823815a8048e0d29c26d8' 
  AND token = 'zpyWy9Y6DGE1ETAU8PTZs/mL60NcRq0iWvelrMhpDkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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