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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc194d919db94ab0633cb3714386674901348a0f7b740643904719d929c30f80' 
  AND token = 'EOuvQtCZbbz9b1wRzTk5ozA2RIqSvw5Mr4mpIkDb6IU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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