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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29f04cdc5510f42c6701dcb9f27b8bb9ecea8aca9fdbdf19bb4082c2abb838a1' 
  AND token = 'qYcof+ZSWcNg6xwh2CqGFmZevm4Betl+PgXD61Cqzf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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