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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd6e8d967d995f0e2fc9278b5a5fd10146c943df5474d2429f4587d9e6f9e520' 
  AND token = '1w/M6miqJ8NqdVzJx1xWYIYkfumFD3yGFctsDDyIsGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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