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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e43a5febb90449a0ee4e4725db85826afdac2b66e211e3331ecd0c019836f52a' 
  AND token = 'TmrJXp6bb6iVznMNFVIKYQy8ifO82tEOcUG0bb5P6Uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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