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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '616399209d12004e7ced7c077f6fd3b42c300dc717cb041ff7ccf3190de418aa' 
  AND token = '1on0Q3skFujUuItouQjBcff6usIZ36rxc2ohubrqyHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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