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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79e0f90770a05d04f76416bdcd81139e4cc7fb013dc52703a903b31e73adce1e' 
  AND token = '8k8E5+WbSF095KDuy0G8wc5ULdWDmEa3+vOMg+p0IEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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