SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a47d2f69d72d84bcb35a51589e8849e5f70e046990cdd76adad7cda244c3d37' 
  AND token = 'nubMp4yYhrPzHY5kVhsl1BL2Qww2gQ0ASx3qwBxGYLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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