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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8af1eef03109a6009751f631fc65db412327634bb2eef226c5a71408ad87fc4' 
  AND token = 'D6N1fVX7kzy+NZ3MrhG51YZswO3vybbZKL+hyzQpaNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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