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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a507ddc84342562f93f58d5c813b658a3de41f7cf0676a7daadaa9a147f1c3e' 
  AND token = 'UcCrnqv92B+awoOjZN57mrou/9hn+FhI/6xa4685Pvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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