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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e23650cc1cd10f9c325cb5ab9263c51bcf52f23f96c252c272b59e48f1a148e8' 
  AND token = 'fGa/zVmKhfjUc+3i2zxReo38SOjVgsD7HCmZ7jl2GXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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