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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fcc4e47181cbc36df2f6831738e4f1283839fa8f6f9cc14fb6012ab8f7f6677' 
  AND token = 'N23k4p6+QY1XDbNcLLABs5jaPcZENieTOdfd28xLyl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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