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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d3af2ee6515b486fd4761df65653c469f443c1b2277f3f03c32be7fb44a1cc0' 
  AND token = 'rtko0NYlUvy6zietHZ49qfHUJi2USBvUqWm3+SYbwLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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