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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c374311d28c090ab83c2a49c0995b3a9ed5e6927b5efa5e8141b6d8ae779c16' 
  AND token = 'B/0o8GoKqJdUy5R9D7ar/RkE7lKkdOmwaYPhDeDoFLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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